feat(developer): add api documentation to build

Relates to #10207.

Adds the `api` action to build.sh for each affected module. The `api`
action for each module will generate the api metadata files, and then
the markdown files are generated by /developer/build.sh api.

Note that developer-utils, kmc, and kmcmplib have no api documentation
at this time (and kmcmplib is not Typescript so would need separate
tooling anyway).